Algal Bloom in Waipara River at Teviotdale Bridge

The Community and Public Health division of the Canterbury District Health Board have issued a health warning after potentially toxic blue-green algae (benthic cyanobacteria) were found in the Waipara at the Teviotdale Bridge.

This is in addition to the warning already in place at Stringers Bridge.

Humans and animals, particularly dogs, should avoid the Waipara River at both Teviotdale Bridge and Stringers Bridge until the health warning has been lifted. 

Canterbury Medical Officer of Health Dr Alistair Humphrey says the algal mats can produce toxins harmful to humans and animals.

“Exposure may cause skin rashes, nausea, stomach cramps, tingling and numbness around the mouth and fingertips,” Dr Humphrey says.

“If you experience any of these symptoms, visit your doctor immediately, also let your doctor know if you’ve had contact with dark brown/black algal mats or water in this area.”

“No one should drink the water from the river at any time.”

Boiling the water from the river does not remove the toxin. However, reticulated town water supplies are currently safe.

Animals should be taken to a vet immediately if they come into contact with the contaminated rivers.

Environment Canterbury is monitoring the sites and the public will be advised of any changes in water quality.


Facts about cyanobacteria:


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Or contact Community and Public Health on (03) 364 1777.